<template>
  <!-- 底部部分 -->
  <footer class="footer">
    <span class="todo-count"
      >剩余<strong>{{ leftCount }}</strong></span
    >
    <ul class="filters" @click="$emit('changeType', type)">
      <li><a @click.prevent="type = 'all'" :class="{selected: type === 'all'}" href="#/">全部</a></li>
      <li><a @click.prevent="type = 'active'" :class="{selected: type === 'active'}" href="#/active">进行中</a></li>
      <li><a @click.prevent="type = 'completed'" :class="{selected: type === 'completed'}" href="#/completed">已完成</a></li>
    </ul>
    <button @click="clear" v-show="showClear" class="clear-completed">
      清除已完成
    </button>
  </footer>
</template>

<script>
export default {
  name: "VueXuxiTodoFooter",

  data() {
    return {
      type: 'all'
    };
  },
  props: {
    list: {
      type: Array,
      required: true,
    },
  },
  computed: {
    leftCount() {
      return this.list.length;
    },
    showClear() {
      return this.list.some((item) => item.isDone);
    },
  },
  methods: {
    clear() {
      this.$emit("clearDone");
    },
  },
};
</script>

<style lang="scss" scoped></style>
